diff options
Diffstat (limited to 'toys/sha1.c')
-rw-r--r-- | toys/sha1.c | 190 |
1 files changed, 0 insertions, 190 deletions
diff --git a/toys/sha1.c b/toys/sha1.c deleted file mode 100644 index 7c598c88..00000000 --- a/toys/sha1.c +++ /dev/null @@ -1,190 +0,0 @@ -/* - * Based on the public domain SHA-1 in C by Steve Reid <steve@edmweb.com> - * from http://www.mirrors.wiretapped.net/security/cryptography/hashes/sha1/ - */ - -/* #define LITTLE_ENDIAN * This should be #define'd if true. */ -/* #define SHA1HANDSOFF * Copies data before messing with it. */ -#define LITTLE_ENDIAN - -#include <stdio.h> -#include <string.h> -#include <inttypes.h> - -struct sha1 { - uint32_t state[5]; - uint32_t oldstate[5]; - uint64_t count; - union { - unsigned char c[64]; - uint32_t i[16]; - } buffer; -}; - -void sha1_init(struct sha1 *this); -void sha1_transform(struct sha1 *this); -void sha1_update(struct sha1 *this, unsigned char *data, unsigned int len); -void sha1_final(struct sha1 *this, unsigned char digest[20]); - -#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits)))) - -/* blk0() and blk() perform the initial expand. */ -/* I got the idea of expanding during the round function from SSLeay */ -#ifdef LITTLE_ENDIAN -#define blk0(i) (block[i] = (rol(block[i],24)&0xFF00FF00) \ - |(rol(block[i],8)&0x00FF00FF)) -#else -#define blk0(i) block[i] -#endif -#define blk(i) (block[i&15] = rol(block[(i+13)&15]^block[(i+8)&15] \ - ^block[(i+2)&15]^block[i&15],1)) - -static const uint32_t rconsts[]={0x5A827999,0x6ED9EBA1,0x8F1BBCDC,0xCA62C1D6}; - -void printy(unsigned char *this) -{ - int i; - - for (i = 0; i < 20; i++) printf("%02x", this[i]); - xputc('\n'); -} - -/* Hash a single 512-bit block. This is the core of the algorithm. */ - -void sha1_transform(struct sha1 *this) -{ - int i, j, k, count; - uint32_t *block = this->buffer.i; - uint32_t *rot[5], *temp; - - /* Copy context->state[] to working vars */ - for (i=0; i<5; i++) { - this->oldstate[i] = this->state[i]; - rot[i] = this->state + i; - } - /* 4 rounds of 20 operations each. */ - for (i=count=0; i<4; i++) { - for (j=0; j<20; j++) { - uint32_t work; - - work = *rot[2] ^ *rot[3]; - if (!i) work = (work & *rot[1]) ^ *rot[3]; - else { - if (i==2) - work = ((*rot[1]|*rot[2])&*rot[3])|(*rot[1]&*rot[2]); - else work ^= *rot[1]; - } - if (!i && j<16) work += blk0(count); - else work += blk(count); - *rot[4] += work + rol(*rot[0],5) + rconsts[i]; - *rot[1] = rol(*rot[1],30); - - // Rotate by one for next time. - temp = rot[4]; - for (k=4; k; k--) rot[k] = rot[k-1]; - *rot = temp; - count++; - } - } - /* Add the previous values of state[] */ - for (i=0; i<5; i++) this->state[i] += this->oldstate[i]; -} - - -/* SHA1Init - Initialize new context */ - -void sha1_init(struct sha1 *this) -{ - /* SHA1 initialization constants */ - this->state[0] = 0x67452301; - this->state[1] = 0xEFCDAB89; - this->state[2] = 0x98BADCFE; - this->state[3] = 0x10325476; - this->state[4] = 0xC3D2E1F0; - this->count = 0; -} - -/* Run your data through this function. */ - -void sha1_update(struct sha1 *this, unsigned char *data, unsigned int len) -{ - unsigned int i, j; - - j = this->count & 63; - this->count += len; - - // Enough data to process a frame? - if ((j + len) > 63) { - i = 64-j; - memcpy(this->buffer.c + j, data, i); - sha1_transform(this); - for ( ; i + 63 < len; i += 64) { - memcpy(this->buffer.c, data + i, 64); - sha1_transform(this); - } - j = 0; - } else i = 0; - // Grab remaining chunk - memcpy(this->buffer.c + j, data + i, len - i); -} - -/* Add padding and return the message digest. */ - -void sha1_final(struct sha1 *this, unsigned char digest[20]) -{ - uint64_t count = this->count << 3; - unsigned int i; - unsigned char buf; - - // End the message by appending a "1" bit to the data, ending with the - // message size (in bits, big endian), and adding enough zero bits in - // between to pad to the end of the next 64-byte frame. Since our input - // up to now has been in whole bytes, we can deal with bytes here too. - - buf = 0x80; - do { - sha1_update(this, &buf, 1); - buf = 0; - } while ((this->count & 63) != 56); - for (i = 0; i < 8; i++) - this->buffer.c[56+i] = count >> (8*(7-i)); - sha1_transform(this); - - for (i = 0; i < 20; i++) { - digest[i] = (unsigned char) - ((this->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255); - } - /* Wipe variables */ - memset(this, 0, sizeof(struct sha1)); -} - - -/*************************************************************/ - - -int main(int argc, char** argv) -{ - int i, j; - struct sha1 this; - unsigned char digest[20], buffer[16384]; - FILE* file; - - if (argc < 2) { - file = stdin; - } - else { - if (!(file = fopen(argv[1], "rb"))) { - fputs("Unable to open file.", stderr); - exit(-1); - } - } - sha1_init(&this); - while (!feof(file)) { /* note: what if ferror(file) */ - i = fread(buffer, 1, 16384, file); - sha1_update(&this, buffer, i); - } - sha1_final(&this, digest); - fclose(file); - printy(digest); - exit(0); -} |